Table-forwarding mechanism.



w. M. & P. DfROBERTS.

TABLE FORWARDING MECHANISM. APPLICATION FILED OCT. 3. 1914.

1,189,871. Patented July 4, 1915.

' WITNESSES: INVENTOHS (M Roberts.

@225 ZZZ RD. fioferta; F v Arm/m UNITED STATES PATENT OFFICE WEBSTER M.ROBERTS AND PARK 1). ROBERTS, OF ST. JOSEPH, MISSOURI.

TABLE-FORWARDING MECHANISM.

Application filed October 3, 1914. Serial No. 864,965.

T 0 all whom it may concern Be it known that we, WE'BSTER M. Rom

Bars and PARK D. ROBERTS, citizens of the United States, residing at St.Joseph, in the county of Buchanan and State of Missouri, have inventedcertain new and useful Improvements in Table-Forwarding Mechanism; andwe do declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

Our invention relates to table forwarding mechanism, and moreparticularly to mechanism for imparting step by step motion to a rotarytable; the principal object of the invention being to provide a devicewhereby a rotary table may be intermittently forwarded a predetermineddistance and looked. after each movernent. In accomplishing this objectwe have provided the improved details of structure hereinafter describedand illustrated in the accompanying drawings, wherein:

Figure I is a perspective view of a rotary table provided with aforwarding mechanism constructed in accordance with our invention. Fig.II is a plan view of the forwarding mechanism, showing-a por-- tion ofthe table. Fig. 111 is an enlarged sectional view of the forwardingpawl; the functional position thereof being shown in dotted lines. Fig.IV is a detail perspective view of a portion of the under face of thetable.

Referring more in detail to the parts 1 designates a pedestal, or thelike, having a central shaft 2, and revolubly mounted on said shaft is atable 3 which may be of.

any suitable construction, but preferably comprises a skeleton framehaving inner Specification of Letters Patent.

paem'd atl 4,- 1916.

short distance beneath the under face of the ring 4. t

- Slidably mounted in the brackets 15011 the crossbar 13, andimmediately beneath the ring 4 is an' arc-shaped bar 16, of the samecurvature as the saidfring, and pivotally mounted between the ribs 17onsaid bar is an angular pawl 18, one leg of which normally lies betweenthe ribs 17 and is adapted to engage the teeth 9 and the other leg ofwhich projects downwardly through a slot 20 in the bar. Integral withthe pawl 18 is a stop21 which-is adapted to contact with the bar 16 tolimit the movement of the pawl, as clearly shown in Fig. III.

Revolubly mounted inthe frame 10 is a shaft 22, having an eccentricdisk'23 which carries a band 24 and rod 2 5 lthelatter being connectedwith the angular, pawl 18 by means of a universal coupling 26] Mountednear one end, of the bar 13 is a bracket 27in which is pivotally mounteda latch 28 having a notch 29 ada'pted to engage any one of the teethQofthe table:

The latch. 28 is yieldingly tensionedi upwardly by a" coil spring 30whicl-rlbears' against a bracket 31 onthe -..c rossbar 13 and whichsurrounds a rod. 32that isconne'cted with the latch 28 and with abellcrank? lever 33; the latter being pivotally' mounted in a bracket 34: onthe crossbar-12 andadapted for engagement by 'a laterally extending boss35 on the eccentric band 2 1.

In using the device, the shaft 22 and eccentric disk 23 are revolved byany suitable means, such as a motor (not shown) so that the rod 25 isreciprocated. 'On'the forward movement of the rod the angular pawl 18 isforced between ribs 17 and stopped so that continued movement of theeccentric causes the arc-shaped bar 16 to move in its brackets centriccontinues to revolve, the rod 25 is drawn forward so that the angularpawl is vmoved'against the shoulder2l and against the teeth 9 of thetable so that continued revolution of the eccentric draws the bar 16 andthe table forward. As soon as the table has moved a short distance theboss 35 releases the lever 33 and the latch 27 rises under the influenceofthe spring 30, so that when the eccentric has moved the'tabie to thelimit of its travel, the latch automatically engages the next succeedingtooth .9 and locks the table against further move-- ment until. thecycle is repeated.

is apparent that with the herein de scribed mechanism, the table maybeforwarded at regular intervals and an equal distance at each movement,and that it. is locked positivelyat the end of each step.

Having thus described our inventiomwhat we claim as new therein, anddesire to secure by Letters-Patent, is j .1. The combination ivith arev'oluble member. of a sliding bar located. adjacent the revolub'lemember and provided with aslot, a pawl pivotally mounted on the bar andprojecting through the slot, one arm of said pawl being adapted forengagement with the reroluble niembcr,.and an eccentric havinglinkconnection with the other arm of the pawl. i

2. The combination with a revoluble member, having teeth on' itsunderface, of

ad a-rc'uatile bar located beneath tliefiaiithed' portion oit'thererolubie member and adapted for movement in a path parallel therewith,a pawl pivotally mounted in the bar and having an arm adapted forengagement with said teeth, an eccentric connected with the opposite armof the pawl and adapted for positively moving the pawl'to engagementwith the teeth and advancing the rev-' oluble member upon forwardmovement of the bar, and for positively disengaging the pawl andreturning said bar, for the purpose set forth.

The combination with a revol'uble member. of a bar movable adjacent therevoluble member, a pawl on said bar. an ecoluble member having teeth ia str p form meager-i centric operatirely'connecte" to positively induceengagen 11L oi with the revolubie member and positdisengage the same. alock for holding, the

revoiubie member during the period of disengagement at the pawi, andmeans operable by the eccentric for controlling the lock.

4. The combination with an annular revnmed thereon; of a pawi "-arriermounted adjacent to said teeth and adapted to be moved 151 a pathparailel therewith, said pawl carrier having: a slot formed verticallythrough the central portion thercr. f; an angular pawloscillatablymounted in said slot. the upper portion oit said pawlprogectm; thereabovc whileits lower portion extends below said moved.

In testimony whereof We aliix our signzr tures in presence of twowitnesses.

WEBSTER M. ROIV'HERTH. BARK D. R( )BER"S. 'itnesses Jonn Marts, JOHNMoron.

Weiy I

